Apple has just pushed out a fourth beta version of iOS 7 to developers for testing purposes. You can get the beta via over-the-air update and through the iOS Dev Center. Also available are Xcode 5 Developer Preview 4 and a third beta of the Apple TV software. » Apple Seeds iOS 7 Beta 4 To Developers

Exactly two weeks after releasing the second beta of iOS 7 to developers, Apple has just released beta 3. The new beta arrives as build 11A4414e and is available via the over-the-air update to existing beta testers and through the iOS Dev Center. » Apple Seeds iOS 7 Beta 3 To Developers